Method of and means for assembling core laminations



- C. ATKINS.

METHOD OF AND MEANS FOR ASSEMBLING CORE LAMINATIONS.

APPLICATION FILED um. 19. 1915.

1,375,072 Patented p -19,1921,

v UNITED STATES.

PATENT OFFICE.

onmns ATKINS, or cmcntnerr, onro, ASSIGNOR 'ro Anus-calmness MANUFAC-roams oomrm, or MILWAUKEE, WISCONSIN, A oonronarron or DELAWARE,

METHOD OF AND MEANS FOR ASSEMBLING CORE LAMINATIONS.

Application filed January 19, 1916. Serial No. 73,261.

To all whom it ma concern:

Be it known that CHARLES ATKINS, a citizen of the United States residingat Cincinnati, in the county of I-iamilton and State of Ohio, haveinvented a certaln new and useful Improvement in Methods of and Meansfor Assembling Core Laminations, of which the following is aspecification.

This invention relates in general t9 dynamo electric machines, and hasparticular relation to methods of assembling core laminations on asupport and to devices for securing the laminations in osition.

In the construction 0 dynamo electric machines, it is highly desirablethat the core laminations be capable of being expeditiously andeffectively secured in pos1t1on on a supporting element. A d1sadvan'tageof known ty es of devices for securing the laminations in place is that,inassembhng the laminations and the securing devices therefor, thelaminations are preliminarily compressed to a greater extent than whenthe parts are in fully assembled cond1t1on, the laminations beingallowed to expand subsequent to the assembling of the securing orclamping devices which hold the lamlnatlons in this condition ofincomplete compression. When the laminations areassembled and secured inposition in this manner, the core being in a more or less looselyassembled condition, the machine is not capable of the most eiiicientoperation.

it is an object of this invention to provide an improved device forclamping elements or laminations in position on a sup port which deviceaffords expeditious assem-- bling of the clamped parts and is simple inconstruction and efiicient in operation.

It is a "further object of this invention to provide improved method ofassembling and securing the laminations in position on a support.

These other objects are attained by this invention, the various novelfeatures of which will appear from the description drawings, disclosingone embodiment of such invention, and will be particularly pointed outin the claims.

In the accompanying drawings:

Figure 1 is a broken sectional elevation along a radial plane of therotor of a dynamo electric machine embodying this invention.

' Specification of Letters Patent.

Patented Apr. 19, 1921.

F 1gs. 2, 3 and e are enlarged broken views similar to F 1g. 1,illustrating the method of msertmg a clamping element in osition.

Figs. 5, 6 and 7 are enlarged bro en plan views of the rotor shown inFigs. 1, 2, 3 and 4, and correspond to the showing of Figs2, 3 and at,respectively.

Figs. 8 and 9 are perspective views of a clamping element shown in Figs.1, 3, e, 6 and 7, in both its initial and final forms.

In the accompanying drawings, the rotor of a dynamo electric machine, ofthe squirrel-cage 1nduct1on motor type, is shown as comprismga spider orsupport 12 mounted on a shaft 13, the spider arms being designatedby thecharacter 14:. -'lhese spider arms are shown as provided at one side oftheir radially outer ends with a ring-like connection including anintegral radially extending flange 16 which acts as an abutment inassembling the core. The outer ends of the spider arms are machined toform a seat 18 for the core 19. The core is made up of a plurality oflaminations pressed together and held inplace against the flange orabutment 16 by an-end plate 23 which may fit fairly closely on the seatportions 18 at the ends of the spider arms. I

The end plate or ring 23 is held in efi'ective clamping position,wherein it acts as an abutment for the laminations which have a tendencyto spring apart when in fully assembled condition, by means of aplurality oi? clamping devices 25 which are of general T-shape, prior totheir distortion to effective clamping condition, and comprise a bodyportion 26 and extensions 2? therefrom along one edge. The seat portionsof the spider arms are provided with shouldered portions 28 laterallyoutside of the position occupied by the end plate 23 when the structureis fully assembled spaced from position of the end plate to the extentof thickness of the body portion 26 of the clamping device. Theshouldered portion 28 constitutes an abutment and is preferably providedby forming a substantially circumferentially extending recess 29 in theseat portion of each spider arm 14:, the width of the recess beingpreferably such that the body portion 26 of the clamping device 25 maybe received therein with a compara- The extensions 27 of the tivelyclose clamping element prererably lie in liltl eneral lane as the bodortion 26 when I g p y p ters Patentz' thisaelement is'in initial form.Theseextensions. are so disposed relatively to the body portion that thelatter portion may be inserted to clamping position between the endplate 23 and the shoulder 28 by radial or circumferential movement, andthese extensions can then be bent to a position radially within the .endplate and closely adjacent thereto and, preferably, so as to lie closelyadjacent to the sides of end rtions of the splder arms, as indicated 1nFigs. 4 and 7.

It, will be apparent that, in assembling the laminations and clampingring, these parts need be pressed toward the flange 16 only until theyare in the positions they will occupy finally, at which time theclamping devices may be disposed in operative p0 sition with their bodyportions 26 within the slots or grooves 28. and the rejections 27extending beyond the sides 0 the end portions of the spider' arms. Withtheparts in.these positions, it will be ap arent that the and late 23and the core aminations are effectively held against expansion or axialmovement. The'mdividual clamping devices occupy, at this time, thegeneral posi-' tions indicated in Figs. 3 and 6, that.is,'withspiderarms prevents circumferential move .ment of the clamping devices.

While the end plate 23 is shown as being of considerably greaterthiclmess than that of the laminations which make up't he' core,

it will be apparent. that this end plate may be of any suitabledimensions and may, in so far as the general features of the. inventionare concerned, be considered as one of the core laminations.

It will be apparent that, in accordance with the invention disclosed,the laminations of the core may be compressed to the condition whichtheywill retain when the machine is fully assembled; in other words,"there needbe'no final springing apart or separation of the laminationsin the assembling and clamping of the same in opera tive position.

It is to be understood that it is not de.-.

' sired that the invention defined by the claims a be to the exactdetails of construc tion shown and described, for obvious modificationswill occur to a person skilled in the art. a i

erein the body portions 26 abutment an It is claimed and desired tosecure by Let.-

1. A core for electrical machines comprising a supportin member providedwith a circumferential ange adjacent one end and a clrcumferentiallyextending groove adjacent the other end, a plate carried by said memberand located adjacent said groove,

laminae mounted on said supporting member and held between said flangeand said plate, and a clamping device for holding said plate and laminaeagainst movement away from said flange and comprising a body portionlocated partially within said groove and bearing against the outer sideof said plate, and a portion extending from said body portion towardsaid plate and beyond the axially outer side of said plate andcooperative wlth said plate to prevent removal 0 said clamping device.

2. A core for electrical machines comprising a member provided with acircumferential flange adjacent one end and a circumferential grooveadjacent the other end, a clamping late, laminae held between saidflange and said plate, a clampin, for holding said-plate and lamin cagainst movement in' one direction, said clamping device comprising abody portion located partially within said groove, and a projection fromsaid body portion cooperative with a peripheral surface portion of saidplate to retain said clamping device in operative position.

3. In combination, a support provided with a seating surface and anabutment adjacent one edge thereof, core laminae seated on said support,and means including another abutment for retaining said laminae inposition, said retaining means comprising a body ortion bearing againstsaid the axially outer side'of an end one of said laminae, anda-projection from said body portion engaging beneath a peripheralportion of said end lamina to prevent radial displacement of saidretaining means.

4. In a'dynamoelectric machine, a core comprising a plurality oflaminae, a support therefor, said support being provided with anabutment and a groove at a suitable distance from said abutment, and adevice for clamping said laminae against said abutment, said clampingdevlce comprising a body"- portion fitting closely within said groove,and a projection from said body rtion cooperatln'g with an end one ofsaid amanae to prevent radial displacement of said clamping device.

5. In combmation, a support provided with a seating surface, corelaminae seated device on said support, an abutment for said laminae,said sup ort being provided with an axially exten ing, recessedprojection beyond the normal laminae-occupymg' port1on thereof, aclamping plate, a device for holding said clamping p ate against saidlaminae and said laminae in fully assembled condition, said holdingdevice comprising a body portion seated partially within said recess andagainst which said clamping plate bears,

and a projection from said body portion with which a surface of saidplate cooperates to retain said holding device in operative position.

6. In a dynamo electric machine, a sup-- porting member provided with aseating surface and spaced axially extending projections, laminae and anend plate mounted on said seating surface, said projections beingprovided with substantially circumferential grooves, and devices forclamping said laminae and end plate in assembled condition, each of saiddevices comprising a body portion disposed partially within one of saidgrooves and bearing on said end plate, and a substantiall axiallyextending projection from said bo y portion with whlch said end platecooperates to hold said clamping device in operative position, saidaxial projection being disposed outside of said grooves.

7. The method of assembling laminae in position on a support whichcomprises compressing said laminae to their fully assembled condition onsaid support, disposing a clamping device between said compressedlaminae and a shouldered portion of said support to retain said laminaein fully assembled condition on said support, and distorting a portionof said clamping device to a position wherein an end one of said laminaecooperates therewith to prevent removal of said clamping devicefrom'said support.

8. The method of assembling laminae in position on a support whichcomprises compressing said laminae to their fully assembled conditionagainst a flange on said support, disposing a clamping device partiallyin a recess in said su port to retain said lam inae in fully assem ledcondition on said support, and distorting a portion of said clampingdevice to a position beneath one of said laminae to prevent removal ofsaid clam ing device from said support.

9. e method of assembling laminae in position on a support whichcomprises compressing said laminae to their full assembled condition onsaid support, isposing clampin devices against shouldered portions 0circumferentially spaced portions of said support to retain said lamimnin fully assembled condition on said support, distorting portions ofsaid clampin devices to positions wherein one of said aminae cooperatestherewith to prevent removal of said clamping devices from saidsupport.-

' torting portions of said clamping devices to positions whereinjsaidlatter end plate cooperates with said clamping devices to preventremoval thereof from said support.

11. The method-of assembling laminae on a rotor havin a supportingspider with a circumferentia groove in the outer peripheral surface ofone or more arms of the spider, which consists in compressing saidlaminae to fully assembled condition inserting a clamping device in oneof said grooves said clamping device having portions extending out ofsaid groove in substantially radial and circumferential directions, andthen bending said circumferentially extending portion in a planesubstantially tangential to the periphery of the spider. 12. The methodof assembling laminae on a rotor having a supporting spider with a innerperipheral surface of said laminae.

13. In a dynamo electric machine, a rotor comprising laminae and asupporting spider with a circumferential groove in the outer peripheralsurface of one or more of the arms of said spider, a clamping device forsaid laminae having a portion seated in one of said grooves, a portionextending radially, and a portion extending alongside of a radialsurface of one of said arms.

14. In a dynamo electric machine, a rotor comprising laminae and asupporting spider with a circumferential groove in the outerperipheralvsurface of one or more of the arms of said spider, a clampingdevice for said laminae having a portion seated in one of said grooves,a portion extendin radially inventor is a ed hereto.

' CHARLES ATKINS.

